Over the past five years, there have been a number of studies that have concerned themselves with controlling the structure of inorganic networks. Many of these studies have been undertaken due to the need for more advanced or structurally ordered materials in a variety of electrical and optical applications. One of the approaches to create materials that are structurally ordered has been to assemble the higher molecular weight polymers and materials not from monomeric precursors but from partially assembled oligomeric structural building blocks. In the silicone materials area, the well-known completely condensed cages T n or Q n n - offer convenient higher order building blocks for larger structural assemblies. In most cases materials made by employing these cages as the building blocks have afforded gels or insoluble network materials due to the high degree of functionality (typically n) present in these building blocks. In this paper, we report the preparation of soluble resins that are HT8 cages linked together with divinyl species as links made by hydrosilation chemistry and their characterization as it relates to previously reported studies. We have employed a range of linking groups (L) from organics (divinyl benzene) and α−Ω functional siloxanes (from a degree of polymerization, DP, of 2−12). Interestingly, we have also found it possible to make soluble network materials even when employing two linking groups (L) per cage. We have combined the characterization of the high-molecular-weight polymers with detailed characterization of small molecules made by these same hydrosilation reactions to provide insights into some relatively simple model Si−resin systems. The characterization of these relatively simple systems helps provide insights into the structure ↔ property relationships of silicone materials in general.
Articles you may be interested inQuantitative analysis of transient surface reactions on planar catalyst with time-resolved time-of-flight mass spectrometry Rev.An integrating transient recorder (ITR) has been designed, constructed, and evaluated to accomplish time-array detection in gas chromatography time-of-flight mass spectrometry (GC-TOFMS) applications. The ITR consists of a 200-MHz flash analog-to-digital converter, 16 high-speed 1OOK emitter-couple logic (ECL) summing boards, three parallel processors for real-time data reduction, instrument control and routing functions, and a 300-Mbyte mass storage device. The ITR is capable of recording 80 ,US bursts of transient information with a time resolution of 5 ns. For each transient, up to 16 384 sequential time-resolved channels may be recorded. An operator-selectable number of sequential transients may be summed in a locked time registry creating a summed scan file while maintaining the integrity of the transient time resolution. The information from each transient is read, summed, and stored in one of two summing registers ( 16 x 1024 X 24 bits). While incoming information is being stored in one summing register, the information in the other summing register is processed and read out to disk, thus permitting high-speed data collection continuously for long periods of time. The information from successive transients is summed in order to improve signal-tonoise, dynamic range, and sensitivity, and produces scan files at a rate sufficient to maintain all of the chromatographic information. GC-MS data collected at 1, 20, and 50 spectra per second are presented for a nine-component aliphatic/aromatic mixture. Although the ITR was specifically designed for GC-TOFMS studies, the overall design concepts of the ITR are universal and apply to any situation where information from two or more phenomena occur at the output of a single detector and occur over vastly different time domains.
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